Oscillating steam-engine



(No Model.) 7 2 Sheets-Sheet 1. J. E. SMITH.

1 OSUILLATING STEAM ENGINE.

No. 290,713. Patented Dec. 25, 1883.

2 Sheets-Sheet 2.

(No Model.)

J. E. SMITH.

OSGILLATING STEAM ENGINE.

' NiTEn STATES PATENT OFFICE.

JOHN E. SMITH, OF BANGOR, MAINE.

OSCILLATING STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 290,713, dated December25, 1883.

Application filed July 17. 1883.

To all whom it may concern:

Be it known that I, J OHN E. SMITH, of Bangor, in the county ofPenobscot, State of Maine, have invented a certain new and usefulImprovement in Oscillating Steam-Engines, of which the following is adescription sufficiently full, clear, and exact to enable any personskilled in the art or science to which said invention appertains to makeand usethe same, reference being had to the accompanying drawings,forming a part of this specification, in which Figurel is an isometricalperspective view, representing an engine provided with my improvement;Fig. 2, a side elevation of the same; Fig. 3, an end view; Fig. 4, avertical longitudinal section of the cylinder and seat, the piston beingrepresented at half-stroke; Fig. 5, a like view, the piston beingrepresented at full-stroke; and Fig. 6, a vertical transverse sectiontaken on the line a: as, Fig. 5.

Likeletters of reference indicate corresponding parts in the differentfigures of the drawings.

inder, these parts being of the ordinary form and construction, exceptas hereinafter specified.

Attached to the lower side of the cylinder, and preferably cast integraltherewith, there is a curved projection, D, finished on its outer orlower face to form the arc of a true circle, and provided with theindependent steam-ports a d, said ports opening into the respective endsof the cylinder and downwardly through the projection D. A seat, E,concaved on its upper side to receive the projection D, is -dis posedbeneath the cylinder, said seat being provided with the inductionsteam-pipe m and (No model.)

with the curved exhaust-port f, having the mouth or port 42.

In the use of my improvement, steam is let into the induction-pipe m,from whence it passes through the port a into the cylinder above thepiston G, the piston being forced thereby down to the bottom of thecylinder and the wheel A revolved. As the wheel turns the upper end orhead of the cylinder is elevated, and the port a opened into the port fand the port d into the pipe m. The engine then exhausts from above thepiston Gthrough the ports uf n, while at the same time live steam fromthe pipe m passes through the port d into the cylinder below the piston,and forces it upwardly or toward the rod 13, after which, the wheel Acontinuing to turn, the forward end of the cylinder is again depresseduntil the steam is exhausted from below the piston and live steam let inabove it.

In practice Ihave found that the steam heats the projection D andcylinder 0 with much greater rapidity than it does the seat E when allof these parts are composed of iron, thereby causing the engine to leaksteam when first started up. I therefore construct the seat E of brass,composition, or of some metal which is a better conductor of heat thaniron, whereby this defect is entirely obviated.

The seat is mounted in a carriage or support, H, and provided with theadj ustingscrews Z Z, for forcing it against the projection D, or totake up the wear and produce a steamtight joint between the seat andsaid projection beneath the cylinder 0, which is journaled at '0, tooscillate in the usual manner in the standards J but, instead of thescrews, any other suitable means for the same purpose may be employed.

Having thus explained my invention, what I claim is- 1.' In anoscillating steam-engine, the combination, substantially as set forth,of an oscillating cylinder provided with an arc-shaped projection orrocker composed of metal and having steam-ports, and a concave seathaving steam inlet and exhaust ports and composed of metal which is abetter conductor of heat than the metal of the rocker.

2. The seat E, constructed as described and composed of brass,composition, or some metal which is a better conductor of heat thaniron, port, f, provided with a central discharge, at, in combinationwith the cylinder 0, having the the support H, provided withupwardly-proprojection D, said projection being constructed jectingears, and the horizontal clampingas described and composed of iron,substanscrews ZZ, extending through said ears and sup- 5 tially as andfor the purpose specified. porting said seat, substantially asdescribed.

3. The combination of the oscillating cylinder 0, provided with thearc-shaped projec- JOHN SMITH tion D, having steam-ports a d, openingnear Vitnesses: the center, a concave seat, E, having a central G. A.SHAW,

1o induction-port, m, and an arc-shaped exhaust- L. J. WHITE.

